Robert e



(No Model.)

R. E. SWARTZ. MUSIC LEAF TURNER.

Patented June 28,1898.

ROBERT E. SVARTZ, OF ORESTON, IOVA, ASSIGNOR OF ONF-HALF TO C. F, SKIRVIN, OF SAME PLACE.

MUSIC=LEF TURNER.

SPECIFICATION forming part of Letters Eatent No. 606,252, dated J' une 28, 1898.

Application filed March 5, 1897. Serial No. 626,034. (No model.)

T0 @ZZ wwm it 77mg/ OOMCGWZ: f racks I preferably provide the rack 1 with an Be it known that I, ROBERT E. SWARTZ, a adjustable clip 4, held in the desired posicitizen of the United States, residing at Orestion by means of a thumb-nut 5. (Shown in ton, in the county of Union and State of Fig. 2.)

5 Iowa, have invented anew and useful Music-l Mounted in a tubular bearing G, secured 55 IieafIfIolder, of which the following is a specivertically to the center of the rack, is an oplication. erating-spindle 7, provided with an operat- My invention relates to music-leaf turners, 'ing arm 0r lever 8, said arm being provided and has for its object to provide a simple and vwith a return-spring 9 secured at one end to 1o efficient construction and arrangement of the under side of the ledge or rest 2. The 6o i parts whereby the leaves of a book or sheetoperating arm or lever is provided with an music may be turned consecutively with the extension 10, to bear against an intermediate minimum exertion upon the part of the opportion of the spring 9 as the arm or lever is erator, and to provide adjusting devices turned to operate the spindle 7 in opposition i 5 wherebythe parts of the apparatus may be to the tension of the spring, and a stop-pin 65 arranged to suit books and sheets of differ- 11 is disposed in the path of the arm or lever ent heights. to limit the return movement thereof. j

Further objects and advantages of this in- Fitted for sliding adjustment upon the upvention will appear in the following descripper portion of the tubular bearing 6 is a sleeve zo tion, and the novel features thereof will be 12, havinga lateral slot 13, through which eX- 7o particularly pointed out in the appended tends a set-screw 14, and it will be seen that claims. by tightening. this screw the sleeve *may be In the drawings, Figure 1 is a front view of locked at any desired vertical adjustment a leaf-turning apparatus constructed in acupon the tubular bearing. The upper end of z5 cordance with my invention. Fig. 2is averthe sleeve is constructed, as shown in detail 75 tical central section of the operating devices in Fig. 4, to form a series of concentric thimon the line 2 2 of Fig. 1. Fig. 3 is avertical bles 15 and 1G, constituting interior journals, sectional view of the operating mechanism on and as these thimbles are split longitudinally the line 3 3 of Fig. 2. Fig. 4: is a detail view to form open sides 15P and lOit will be seen 3e in perspective of the journals in which the that they exert a clamping or clasping pres- 8o turning-arms are mounted. Fig. 5 is a detail sure upon the hubs 17 of the turning-arms view in perspective of the hub of one of the 1S, which are fitted therein for concentric roturning-arms. Fig. 6 is a detail transverse tation, the open sides of said thimbles facilisection on the line 6 G of Fig. 3. tating the mounting of the hubs 17 within the 3 5 Similar numerals of reference indicate corthimbles. Furthermore, the thimbles are pro- 8 5 responding parts in all the figures of the drawvided in their front sides with horizontal slots ings. .l5b and 1Gb, in which the turning-arms 1S 1 designates a rack adapted to be applied swing as the hubs thereof are turned in the `to the music-rack of a piano, organ, or simijournals provided by the thimbles.

4o lar instrument or to be substituted for the .The means which I have devised forjcom- 9o rack of an orchestra music-stand or its equivmunicating consecutive motion to the turnalent, the same being provided at its bottom ing-arms includes a tubular slide 19, iitted with a ledge or rest 2 for supporting the book upon the spindle 7 and secured at the desired or sheet and with clamps 3 for engaging the adjustment to suit that of the sleeve 12 by 45 back of a book or sheet or the leaves thereof means of a set-screw 2O and a selecting-pawl 95 which are not to be actuated by the turning- 2l, fulcrumed upon said slide and yieldingly arms, said clampsbeing preferablyconstructheld in its normal position by means of an ed of spring-wire or its equivalent, having a actuating-spring 22. The lower-,end of this tendency toward the plane of the rack. For slide extends downward through the hub of 5o engagement with piano and organ musicthe innermost turning-arm and bears upon roo the bottom of the thinible in which said hub is mounted, whereby the proper relative adj ustmcnt of the slide and sleeve is determined.

Each turning-arm hub is provided with an upwardly projecting ear i7, which is arranged in the path of the free end of the selecting-pawl 2l, said pawl being adapted to engage the contiguous edge of said ear to impart rotary movement to the hub when the spindle 7 is actuated, and in order that the pawi may engage the outermost hub and thus communicate motion to the turning arms consecutively said pawl is titted with a cam 2S, which slides upon the edges of the ears of the hubs, and thus swings the pawl outwardly against the tension ofjits actuatingspring 22 until the extremity of the pawi reaches the plane of the outermost ear. -When such engagement occurs, the rotary motion et the pawl received from the turning-spindle is communicated to the turning-arm.

rlhe tension oi' the light pawl-operating spring is such as to allow the pawi to yield outwardlyby reason ot the contact of its cam-surface 23 with the ends ot' the turning-arm hubs without overcoming the resistance offered by the contractile journals to the swingin movement of the arms, and this outward movement of the pawl continues until the .tlat end surface thereof bears squarely against the end surface of the outermost hub, when, the spring being sufficiently strong to overcome any outward motion due to centrifugal torce, there will be no longer any tendency on the part of the pawi to move away from the operating-spindle, and hence the motion thereof in a path concentric with the spindle will be imparted to the outermost turning-arm hub.

It will be understood that while provision is made in the construction illustrated in the drawings for only two turning-arms this number maybe increased by correspondingly increasing the number ol journals with which the sleeve is i'itted. The upper end ot the spindle is Afitted in a bearing 2st at the upper end ot the rack and is engaged by a nut 25, and it is obvious that by removing said nut the spindle may be withdrawn after loosening the set-screws le and 20, after which the slide l0 may be removed to enable the sleeve 12 to be interchanged with another having a ditlerent number of journals.

Two important advantages are secured by the peculiar construction ot the means for mounting the turning-arms, as hereinbefore described, these advantages being particularly apparent when the turning device is provided with a comparatively large number of arms. It is well known that the peculiar construction of the device causes the selecting means, consisting of the pawl 2l and attachments, to turn the arms consecutivelyin an unvarying order. In other words, the same arm is always operated first in the use of the device. Hence it happens that after protracted use thc journals of certain ot' the arms are worn to a greater extent than others owing to the fact that certain of the arms are exposed to more extended use than the others. This dilierence in the use makes it necessary, in order to extend the life of the appz'tratus, to provide means for taking up the wear of the journals, and it is desirable to provide means for automatically taking up this wear. Hence l have devised the independent yield ing means for frictionally engaging the hubs of the turning-arms, the contraction ot said means serving to maintain a perfect bearing foreach hub irrespective et the wearing of the part-s, and the adjustment ot' either of said yielding means is accomplished independently of the other means to suit the amount of wear of the particular hub which is held in place thereby. The other advantage attained by the above-mentioned specific construction resides in the tact that the provision of independent means ior trietionally y holding the hubs of the turning-arms in their several adjusted positions enables me to dispense with means, outside ot the bearings et said hubs, for preventing the l'novement ot' the selecting' device from being communicated to more than one turning-:nan at a time. In other words, cach turning-arm is provided with its particular brake, which7 consisting ot a con tractile bearing, is located com pactly, and hence is not exposed to eontactwithsurrounding objects. Theret'ore the selecting pawi acts upon each turning-arm independ ently of all ot the remaining turning-arms, and there is no possibility of communicating the motion ot one turning-arm to another.

The turning-arms are iitted with the usual clasps 26 for engaging the leaves ot a bool; or sheet to be turned, and a center holding rod 27 is preferably attached to the sleeve l) to lie in the center of such book or sheet.

Various changes in the term, proportion, and the minor details of construction may be resort-ed to without departing from the spirit or sacrificing any of the advantages oi' this invention.

Having described my invention, what I claim isl. In a lcat`-turning apparatus, the combi nation of turning-arms arranged in contiguous planes and having concentric hubs, provided with contigueus ears or projections, and yieldingly held in their normal positions to prevent accidental rotary movement, a selecting device having a pawl mounted to traverse a path concentric with the hubs oi the turning-arms, and adapted to swing in a plane which radiates from the center of the hubs, said pawl being provided with contiguous cam and tiat surfaces for engagement with the ears or projections of the hubs, whereby it is adapted to swing from Athe axis of the hubs until its fla-t surface engages the ear or projection of the outermost hub, and actuat- ,ing devices for moving the pawl in `its eencentrie path, substantially as specilied.

2. In a leaf-turning apparatus, the combil nation of turning-arms arranged in contign IOO IIO

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ous planes and having concentric hubs provided with contiguous ears or projections, said hubs being yieldingly held in their normal positions to prevent accidental rotary movement, a selecting device having a pawl mounted to traverse a path concentric with the hubs, and to swing in a plane radiating therefrom, said pawl being provided with cam and dat surfaces for engagement with the ears or projections of the hubs, and with a light spring to resist the outward-swinging movement of the pawl when its cam-surface engages the edges of the ears or projections, the resistance of said spring being less than the resistance of the turning-arms to rotary movement, whereby the pawl receives an ou tward-swingin g movement to bring its flat surface in contact with the ear or projection ot the outermost hub, and actuating devices for imparting rotary movement to the pawl, substantially as specified.

3. In a leaf-turning apparatus, the combination of turning-arms arranged in contiguous planes and having concentric hubs frictionally held from accidental rotary movement, and provided with contiguous ears or projections, a selecting device having a pawl, provided with a light actuating spring, mounted to traverse a path concentric with the hubs and to swing in a plane radiating therefrom, and provided with means for selecting and engaging the ear or projection of the outermost hub, and actuating devices for imparting rotary movement to the pawl, substantially as specified.

4. In a leaf-turning apparatus, the combination of turning-arms having hubs provided with concentric friction-surfaces, a stationary spring in contact with the friction-surface of each hub, to hold the turning-arms in their several adjusted positions, and means for selecting and consecutively actuating the hubs in opposition to the holding-springs to impart swinging movement to the turning-arms, substantially as specied.

5. In aleaf-turning apparatus, the combination of concentric contractile j ournals,turn ing-arms having tubular hubs tted in said journals and yieldingly held thereby in their adjusted positions, and means for consecutively actuating the arms to impart swinging movement thereto, substantially as specified.

G. In a leaf-turning apparatus, the combination with a spindle yieldingly held in its normal position, and means for actuating the same, of a series of interior journals concentric with said spindle, turning-arms having tubular hubs fitted in said journals and provided with ears arranged in a common plane, a slide fitted upon the spindle and provided with locking devices whereby it may be secured at the desired adjustment, a yielding pawl carried by the slide for engaging the ears of the turning-arm hubs consecutively, and means for adjusting said concentric journals longitudinally of the spindle, substantially as speciiied.

7. In a leaf-turning apparatus, the combination of a tubular bearing, a spindle mounted in said bearing and provided with a returnspring and an actuating-lever,a sleeve mounted upon the tubular bearing and carrying concentric interior journals, means for securing said sleeve at the desired vertical adjustment, turning-arms having their hubs fitted in said journals and provided with projecting ears arranged in a common transverse plane, a slide adj ustably fitted upon the spindle, and a selecting-pawl carried by the slide for engaging the ears of the hubs, substantially as specified.

S. In a leaf-turning apparatus, the combination with a spindle mounted in iixed bearings and yieldin gly held in its normal position, of interior journals arranged concentric with said spindle and means for adjusting the same parallel with the axis thereof, turning-arms having their hubs fitted in said journals and adjustable therewith, and a selecting device adj ustably mounted upon the spindle and provided with means for consecutively engaging the hubs of the turning-arms, whereby the tu rning-arms and cooperating devices may be adj usted vertically to suit the height of the book or sheet of which the leaves are to be turned, substantially as speciiied.

9. In a leaf-turning apparatus, the combination with a rack, of a spindle, leaf-turning devices operatively connected with the spindle, an actuating-lever fixed to the spindle, a contractile return-spring attached at one end to the lever for yieldingly holding the spindle in its normal condition, a stop to limit the return movement of the lever, and an extension lO on the lever for engaging the spring at an intermediate point when the lever is actuated in opposition to the tension of the spring to bow the latter away from the plane of the spindle, substantially as specified.

In testimony that I claim the foregoing as my ownIhave hereto affixed my signature in the presence of two witnesses.

ROBERT E. SWARTZ.

Witnesses:

HUGH M. FRY, GEORGE A. Inn.

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